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Abstract:

In this thesis we examine two samples of Type II-P and II-L supernovae (SNe).
The first sample consists of 20 SNe II-P/L with constraints for their explosion epochs between 0.3 and 8 days. We analyse the rise times of these SNe and find that longer rise times seem to be correlated with higher peak magnitudes, and that Type II-L SNe tend to have longer rise times and higher luminosities than SNe II-P. We additionally perform a parameter study using two separate analytical models to explore the influence of various physical parameters on the rise time. The models are in agreement with the observed trends and show that the progenitor radius influences the rise time to a larger extent than either the ejecta mass or the explosion energy.
In order prepare our analysis of the second sample, we explore relativistic effects that influence the expanding photosphere method when applying it to SNe at cosmologically significant redshifts. We find that for SNe at non-negligible redshifts the observed flux should be converted to the SN rest frame and that a correction of x (1 + z)˄2 needs to be applied to the angular size.
The second sample contains 10 Type II-P and II-L SNe of intermediate redshifts (0.04